Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93c38d4c3b04bf3…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 01:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4b889e46818bede9a6d36531f1fa702 SHA-1: 9a688c72659aa8b3909a7bdca2152768e2bd39e0 SHA-256: c93c38d4c3b04bf35ee435c14dbc44edf0a3315a1d064d95d10f4b8410fe3dee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=bodybuilder+s+kitchen+pdf PDF link annotation
    • https://cdn.sqhk.co/pofoxubo/Aihwz2H/936849621.pdfIn PDF document text
    • http://barivelovone.22web.org/exterior_angle_theorem_coloring_activity_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Cjfhjhf/father_and_son_chords_rod_stewart.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/ijgSW5W/vozosipe.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/jahjRgc/26133812973.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/pcIjajr/kekekovamekila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_45698bbac2d9457b8eecadb1e10f1628.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_825866144cbd4e249b9d1d2ce0cc8a27.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_27777bff7dfe491497b23d2aef3e9fac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/granny_mod_apk_hack.pdfIn PDF document text
    • http://niruvizuzeta.epizy.com/how_to_set_up_directv_remote_to_insignia_tv.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_4c0831801b464e11b5049fdebbf1f3da.pdf?index=trueIn PDF document text
    • http://pidosowot.epizy.com/osrs_f2p_ironman_mining_guide.pdfIn PDF document text
    • http://wibotej.epizy.com/12201067837.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_83c7dc06da464c0fb33d473480728459.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_800f3c0f749545bdb9ef6c341649f305.pdf?index=trueIn PDF document text
    • http://xumidexasij.epizy.com/74305981659.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_b612853c191d46c6a83aec2f2547f657.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/allegiant_movie_english_subtitles.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5388 bytes
SHA-256: 83a46b26595a467591fb5f059c410ef2d2dda9ff1f9a3172fd9542fb78094281
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 13604 bytes
SHA-256: e6eedd70d7e673f33e498cce4ed74a6368d1196d63b9bc93a998205a4ee22d61

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